Jetboil Jetpower Fuel is a high-performance propane/isobutane four-season blend that gives great efficiency for minimal consumption.__ Propane provides higher vapour pressure for better performance in cold weather, while Isobutane provides more constant pressure as the fuel level gets low. __ This 100g fuel canister will pack inside Jetboil Personal Cooking Systems.__ And don't forget, empty fuel cans are recyclable with the Jetboil CrunchIt Tool.